What would cause white lines to be drawn accross a textured quad? I have a quad and the texture appears and the vertex colors affect the color also, but then I get this (usually single) straight light at some obscure angle, in white, accross the quad. When I position the quad at different coordinates the line sometimes stays in the same orientation and sometimes shifts to a different angle. There is no rotation going on in the modelview matrix. Also the line isn't fixed to where the edge of one of the triangles would be.
Any ideas?
Any ideas?